University of Oulu

Leinonen Jukka, Vähänikkilä Hannu, Raninen Ellinoora, Järvelin Laura, Näpänkangas Ritva, Anttonen Vuokko, The survival time of restorations is shortened in patients with dry mouth, Journal of Dentistry, Volume 113, 2021, 103794, ISSN 0300-5712,

The survival time of restorations is shortened in patients with dry mouth

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Author: Leinonen, Jukka1,2; Vähänikkilä, Hannu3; Raninen, Ellinoora2;
Organizations: 1Department of Clinical Dentistry, Faculty of Health Sciences, UiT The Arctic University of Norway, Hansine Hansens veg 18, 9019 Tromsø, Norway
2Research Unit of Oral Health Sciences, Faculty of Medicine, University of Oulu, Aapistie 3, 90220 Oulu, Finland
3Northern Finland Birth Cohorts, Arctic Biobank, Infrastructure for Population Studies, Faculty of Medicine, University of Oulu, Aapistie 5, 90220 Oulu, Finland
4Medical Research Center, Oulu University Hospital and University of Oulu, Kajaanintie 50, 90220 Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.8 MB)
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Language: English
Published: Elsevier, 2021
Publish Date: 2021-11-15


Objectives: The aim of this retrospective data collection study was to determine the effect size of dry mouth on the survival of restorations and teeth.

Methods: The data were collected from the electronic patient files of City of Oulu Public Dental Services (Finland). Study population consisted of 71 dry mouth patients and 142 control patients. The survival of 3208 restorations were analyzed using Kaplan-Meier survival curves and multivariate Cox regression analysis with shared frailty for patients. Separate analyses were performed for the survival of the teeth.

Results: The hazard ratio of restorations in dry mouth patients was 2.08 (95% CI: 1.65–2.63) compared to the control patients. For the dry mouth patients, the fixed prosthetic crowns outlasted composite fillings of all sizes, but the difference increased concomitantly with the filling size. The dry mouth patients had hazard ratio of 1.98 (95% CI: 1.02–3.82) for tooth extractions compared to the control patients. The teeth with fixed prosthetic crowns outlasted the teeth with direct restorative materials.

Conclusions: The survival time of restorations and teeth are severely shortened in patients with dry mouth. Especially the survival time of the large composites is short in dry mouth patients whereas fixed prosthetic crowns have acceptable survival time also in dry mouth patients.

Clinical significance: When informing a dry mouth patient on the expected survival of a restoration or tooth, one should take into account that dry mouth patients’ restorations and teeth have severely shortened survival time.

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Series: Journal of dentistry
ISSN: 0300-5712
ISSN-E: 1879-176X
ISSN-L: 0300-5712
Volume: 113
Article number: 103794
DOI: 10.1016/j.jdent.2021.103794
Type of Publication: A1 Journal article – refereed
Field of Science: 313 Dentistry
Copyright information: © 2021 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (